hv_netvsc: Eliminatte the data field from struct hv_netvsc_packet

Eliminatte the data field from struct hv_netvsc_packet.
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/hyperv/hyperv_net.h

@@ -148,9 +148,6 @@ struct hv_netvsc_packet {
 	u64 send_completion_tid;
 	void *send_completion_ctx;
 	void (*send_completion)(void *context);
-
-	/* Points to the send/receive buffer where the ethernet frame is */
-	void *data;
 	struct hv_page_buffer *page_buf;
 };
 
@@ -195,6 +192,7 @@ void netvsc_linkstatus_callback(struct hv_device *device_obj,
 void netvsc_xmit_completion(void *context);
 int netvsc_recv_callback(struct hv_device *device_obj,
 			struct hv_netvsc_packet *packet,
+			void **data,
 			struct ndis_tcp_ip_checksum_info *csum_info,
 			struct vmbus_channel *channel);
 void netvsc_channel_cb(void *context);
@@ -205,6 +203,7 @@ int rndis_filter_device_add(struct hv_device *dev,
 void rndis_filter_device_remove(struct hv_device *dev);
 int rndis_filter_receive(struct hv_device *dev,
 			struct hv_netvsc_packet *pkt,
+			void **data,
 			struct vmbus_channel *channel);
 
 int rndis_filter_set_packet_filter(struct rndis_device *dev, u32 new_filter);

drivers/net/hyperv/netvsc.c

@@ -1008,6 +1008,7 @@ static void netvsc_receive(struct netvsc_device *net_device,
 	int i;
 	int count = 0;
 	struct net_device *ndev;
+	void *data;
 
 	ndev = net_device->ndev;
 
@@ -1047,13 +1048,13 @@ static void netvsc_receive(struct netvsc_device *net_device,
 	for (i = 0; i < count; i++) {
 		/* Initialize the netvsc packet */
 		netvsc_packet->status = NVSP_STAT_SUCCESS;
-		netvsc_packet->data = (void *)((unsigned long)net_device->
+		data = (void *)((unsigned long)net_device->
 			recv_buf + vmxferpage_packet->ranges[i].byte_offset);
 		netvsc_packet->total_data_buflen =
 					vmxferpage_packet->ranges[i].byte_count;
 
 		/* Pass it to the upper layer */
-		rndis_filter_receive(device, netvsc_packet, channel);
+		rndis_filter_receive(device, netvsc_packet, &data, channel);
 
 		if (netvsc_packet->status != NVSP_STAT_SUCCESS)
 			status = NVSP_STAT_FAIL;

drivers/net/hyperv/netvsc_drv.c

@@ -682,6 +682,7 @@ void netvsc_linkstatus_callback(struct hv_device *device_obj,
  */
 int netvsc_recv_callback(struct hv_device *device_obj,
 				struct hv_netvsc_packet *packet,
+				void **data,
 				struct ndis_tcp_ip_checksum_info *csum_info,
 				struct vmbus_channel *channel)
 {
@@ -710,7 +711,7 @@ int netvsc_recv_callback(struct hv_device *device_obj,
 	 * Copy to skb. This copy is needed here since the memory pointed by
 	 * hv_netvsc_packet cannot be deallocated
 	 */
-	memcpy(skb_put(skb, packet->total_data_buflen), packet->data,
+	memcpy(skb_put(skb, packet->total_data_buflen), *data,
 		packet->total_data_buflen);
 
 	skb->protocol = eth_type_trans(skb, net);

drivers/net/hyperv/rndis_filter.c

@@ -351,6 +351,7 @@ static inline void *rndis_get_ppi(struct rndis_packet *rpkt, u32 type)
 static void rndis_filter_receive_data(struct rndis_device *dev,
 				   struct rndis_message *msg,
 				   struct hv_netvsc_packet *pkt,
+				   void **data,
 				   struct vmbus_channel *channel)
 {
 	struct rndis_packet *rndis_pkt;
@@ -383,7 +384,7 @@ static void rndis_filter_receive_data(struct rndis_device *dev,
 	 * the data packet to the stack, without the rndis trailer padding
 	 */
 	pkt->total_data_buflen = rndis_pkt->data_len;
-	pkt->data = (void *)((unsigned long)pkt->data + data_offset);
+	*data = (void *)((unsigned long)(*data) + data_offset);
 
 	vlan = rndis_get_ppi(rndis_pkt, IEEE_8021Q_INFO);
 	if (vlan) {
@@ -394,11 +395,12 @@ static void rndis_filter_receive_data(struct rndis_device *dev,
 	}
 
 	csum_info = rndis_get_ppi(rndis_pkt, TCPIP_CHKSUM_PKTINFO);
-	netvsc_recv_callback(dev->net_dev->dev, pkt, csum_info, channel);
+	netvsc_recv_callback(dev->net_dev->dev, pkt, data, csum_info, channel);
 }
 
 int rndis_filter_receive(struct hv_device *dev,
 				struct hv_netvsc_packet	*pkt,
+				void **data,
 				struct vmbus_channel *channel)
 {
 	struct netvsc_device *net_dev = hv_get_drvdata(dev);
@@ -430,7 +432,7 @@ int rndis_filter_receive(struct hv_device *dev,
 		goto exit;
 	}
 
-	rndis_msg = pkt->data;
+	rndis_msg = *data;
 
 	if (netif_msg_rx_err(net_dev->nd_ctx))
 		dump_rndis_message(dev, rndis_msg);
@@ -438,7 +440,8 @@ int rndis_filter_receive(struct hv_device *dev,
 	switch (rndis_msg->ndis_msg_type) {
 	case RNDIS_MSG_PACKET:
 		/* data msg */
-		rndis_filter_receive_data(rndis_dev, rndis_msg, pkt, channel);
+		rndis_filter_receive_data(rndis_dev, rndis_msg, pkt,
+					  data, channel);
 		break;
 
 	case RNDIS_MSG_INIT_C: